There is a drug in this world that rebuilds the structure of a person's body, changing his genitals.
The drug genderin changes the sex of the person who took it. The drug itself is a blue powder. It can be taken in different ways: you can smoke it, you can dilute it in saline solution and inject it into a vein, you can sniff it. The effect of sex reassignment depends on the method of taking the drug, as well as the duration of action. If you smoke the genderin, then only the genitals will change and the effect will last only a couple of hours. If you sniff out the genderin, then there will be a change of both primary and secondary sexual characteristics (a complete sex change) and the effect will last up to 12 hours. If you take genderin intravenously, both sexes will mix (futanari), and the effect can last up to a day. The transition is painless and takes only a few minutes. Under the influence of the drug, libido increases and sexual sensitivity increases, but at the same time sexual stamina increases.